On Tuesday 08 December 2009 02:27:46 McCash John-GKJN37 wrote:
> Charles,
> 	Yes. I understood that, or so I thought. When dumping with
> nanddump under Linux and not including the -o flag, the output is larger
> than the size listed in /proc/mtd, and can be uploaded to another mtd
> device with nandwrite -o. When dumped with the -o flag, the size the
> same as that specified in /proc/mtd, and the resultant file cannot be
> written with nandwrite -o. When I dump from a partition of the same size
> (as shown in /proc/mtd) on an android phone, using the dump_image-arm
> utility I got from the nandroid package, the result is the same size as
> the partition size value from /proc/mtd. My conclusion was that
> dump_image-arm is not including the oob area in its output.

Sounds like the right conclusion.

>
> 	I looked at the source for dump_image briefly, but I find no
> mention of either "oob" or "out of bounds" anywhere. Where am I going
> off in the weeds?

From a quick scan of the code I would expect that mtd_read_raw also reads oob 
while mtd_read_data does not.

> 		Thanks
> 			John
>
> -----Original Message-----
> From: Charles Manning [mailto:manningc2@actrix.gen.nz]
> Sent: Sunday, December 06, 2009 2:18 PM
> To: yaffs@lists.aleph1.co.uk
> Cc: McCash John-GKJN37; Andrew Hoog
> Subject: Re: [Yaffs] Access to files on a YAFFS2 image
>
> The -o flag is tricky because the meaning is reversed between nanddump
> and
> nandwrite:
> Usage: nanddump [OPTIONS] MTD-device
> ...
> -o         --omitoob            omit oob data
> ....
> Usage: nandwrite [OPTION] MTD_DEVICE INPUTFILE
> ...
>   -o, --oob		image contains oob data
> ...
>
> The dump_image tool contains oob
>
> Look at
> http://svn.infernix.net/nandroid/nandtools/android-imagetools/dump_image
> .c
> to see what you're getting from dump_image.
>
> -- Charles
>
> On Saturday 05 December 2009 10:54:44 McCash John-GKJN37 wrote:
> > Charles,
> > 	For what it's worth, I think I've figured out what's wrong. The
> > size returned in /proc/mtd does not include the oob area. I verified
> > this by creating an mtd device the same size as the one I'm trying to
> > examine an image of, and then dumping it with nanddump. The resultant
> > image is larger than the size of the device. I can also copy this
>
> image
>
> > back in with nandwrite. However if I dump it with the -o option, to
> > exclude oob, the image dumped is exactly the size listed in /proc/mtd.
> >
> > 	Now I just have to find somewhere a precompiled copy of nanddump
> > for ARM. (I have a deep and abiding fear of cross-compilers.) I don't
> > suppose anyone on the list could direct me to such an animal?
> >
> > 		Thanks
> > 			John
> >
> > -----Original Message-----
> > From: Charles Manning [mailto:manningc2@actrix.gen.nz]
> > Sent: Tuesday, December 01, 2009 3:26 PM
> > To: yaffs@lists.aleph1.co.uk
> > Cc: McCash John-GKJN37; Andrew Hoog
> > Subject: Re: [Yaffs] Access to files on a YAFFS2 image
> >
> > What I suggest is that you first start off by running yaffs on the
> > nandsim
> > then doing a dump from that and checking that looks like it should and
> > that
> > you can then nandwrite that back.
> >
> > Once you can make the process work with just one device it is then a
>
> lot
>
> > easier to see why things don't work when importing from somewhere
>
> else.
>
> > -- Charles
> >
> > On Wednesday 02 December 2009 01:57:04 McCash John-GKJN37 wrote:
> > > Charles,
> > > 	OK, so we apparently do have the OOB data in these image dumps
> > > (obtained via the dump_image-arm tool included in nandroid), but
>
> when
>
> > we
> >
> > > attempt to upload them to a nand emulator (under Ubuntu) with
> >
> > 'nandwrite
> >
> > > -a -o', we're still getting the error:
> > >
> > > Input file is not page-aligned. Use the padding option.
> > > Data was only partially written due to error
> > >
> > > : Success
> > >
> > > 	Where do we go from here? Should this work, and if so, how do we
> > > determine exactly what the problem really is?
> > >
> > > 		Thanks much for your help
> > > 			John McCash
> > >
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> >
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